If you have 1 smartphone and you get 2 more smartphones, you now have 3 smartphones! — Limitless Science
I belive that 1+2=a bolt of lightning — Limitless Science
He just said it. — frank
Just because moving your queen in a square isn't allowed doesn't mean you can't do it. — frank
...logic is the normative science of how one ought to think if one intends to pursue truth; — aletheist
Logic does not just set out how we ought speak, but how we can speak. It shows us what sorts of speaking are wrong. — Banno
So is it propositional speech that's bounded by logic? — frank
...that logic has something to do with the way the world is. — frank
This is the view I am rejecting, Frank.
Suppose I argued that your view on, say, abortion is wrong because your mother wears army boots.
@aletheist seems to think (and doubtless I am wrong here, but it will serve) that the appropriate reply is something like "one ought not make such conclusions", as if an ad hom argument were a bit rude, subject to the same sort of rejection as "one ought not pick one's nose in public".
I don't think that is enough. It's not enough to say an ad hom argument is a bit rude; it is also plain wrong; the conclusion does not follow from the premise.
— Banno
Logic does not just set out how we ought speak, but how we can speak. It shows us what sorts of speaking are wrong. — Banno
Well, what is logic? If you have 1 smartphone and you get 2 more smartphones, you now have 3 smartphones! That's logic. — Limitless Science
I don't see the distinction you are trying to set up — Metaphysician Undercover
Language is about the world; logic is about language; so yes, logic has something to do with the world. — Banno
If we come across something illogical, we say "That can't be!" and we go in search of true propositions that straighten the mess out. — frank
The results of the double slit experiment appear to defy logic. — frank
When Heisenberg wrote his famous paper he did not know linear algebra. He had no idea of what a matrix is, and had never previously learned the algorithm for multiplying matrices. He made it up in his effort to un- derstand a puzzling aspect of the physical world. This is pretty evident from his paper. Dirac, in his book, is basically inventing linear algebra in the highly non- rigorous manner of a physicist. After having constructed it and tested its power to describe our world, linear al- gebra appears natural to us. But it didn’t appear so for generations of previous mathematicians.
The language that describes the odd quantum world was created for that purpose. — Banno
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